^ yeah, you're right.
With Ayu it was exactly the same. A BEST 2 was an epic release but it made A COMPLETE seem so.. second-rate xD I dunno how to explain it. It'll be the same if Kuu also did that, it'll be more of a compilation for new fans, or people who don't own her other Best's.. (or of course die-hard fans who just want it, just like how most people here own both A BEST (2) and A COMPLETE)
Edit: now that I think about it, A COMPLETE did add some very nice bonus feautures for the fans. The TA tour, unreleased a-nation performances and a 50p photo booklet. So Kuu's will probably have some very nice extra's as well!